The bonus from END is also meh. It might let you take an extra hit or two, but the further you go, the more lacklustre it gets. Archers don't use shields so they don't get the block rate, the best benefit of END.
Im going to suggest get to 15 spr first... then go rest str and add the 10 spr a little later maybe in 4x or so. Also end in free stat for mages and archers is pretty useless, it's best you get it from gear.